Typical heating mediums include: Clean water Process water Lube and fuel oils. Heat transfer oils Mild and corrosive solution Design feature: BSP / NPT screw plug. - 1” to 4” Capacity: up to 6 kW Screw plug material: Carbon steel, brass, SS304 & SS316. Element material: Carbon steel, Copper, SS304 & SS316. Integral thermostat or thermocouple for temperature control and sensing.